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Finding the Fourth Proportional to 719.45, 991.52 and 561.84

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Solution

The fourth proportional to 719.45, 991.52 and 561.84 is: 774.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.45 : 991.52 = 561.84 : x
  2. Step 2: Convert to fraction form
    719.45/991.52 = 561.84/x
  3. Step 3: Cross multiply
    719.45x = 991.52 × 561.84
  4. Step 4: Simplify right side
    719.45x = 557,074.89
  5. Step 5: Solve for x
    x = 557,074.89/719.45
  6. Step 6: Final answer
    x = 774.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.